/// <inheritdoc />
public void Encode <TPixel>(Image <TPixel> image, Stream stream) where TPixel : unmanaged, IPixel <TPixel>
{
var buf = new byte[_srcArea.Width * sizeof(short)];
var rgb565Buf = new ushort[_srcArea.Width];
var rgba32 = new Rgba32();
for (var y = 0; y < _srcArea.Height; y++)
{
var span = image.GetPixelRowSpan(y);
for (var x = 0; x < _srcArea.Width; x++)
{
span[x].ToRgba32(ref rgba32);
rgb565Buf[x] = Rgb565.Pack(rgba32.R, rgba32.G, rgba32.B);
}
stream.Seek(_framebuffer.PointToOffset(_destPoint.X, _destPoint.Y + y), SeekOrigin.Begin);
Buffer.BlockCopy(rgb565Buf, 0, buf, 0, buf.Length);
stream.Write(buf, 0, buf.Length);
}
}
/// <summary>
/// Decodes the given RGB565 stream into the provided image
/// </summary>
/// <typeparam name="TPixel">The pixel format</typeparam>
/// <param name="stream">The RGB565 stream to read <see cref="ushort" />-encoded image data from</param>
/// <param name="image">The image to read data into</param>
/// <returns>The image passed as the <paramref name="image" /> argument</returns>
private Image <TPixel> DecodeIntoImage <TPixel>(Stream stream, Image <TPixel> image)
where TPixel : unmanaged, IPixel <TPixel>
{
var buf = new byte[_area.Width * sizeof(short)];
var rgb565Buf = new ushort[_area.Width];
for (var y = 0; y < _area.Height; y++)
{
stream.Seek(_framebuffer.PointToOffset(_area.X, _area.Y + y), SeekOrigin.Begin);
stream.Read(buf, 0, buf.Length);
Buffer.BlockCopy(buf, 0, rgb565Buf, 0, buf.Length);
var span = image.GetPixelRowSpan(y);
for (var x = 0; x < _area.Width; x++)
{
span[x].FromRgb24(Rgb565.Unpack(rgb565Buf[x]));
}
}
return(image);
}
